261577060 has 12 divisors (see below), whose sum is σ = 549311868. Its totient is φ = 104630816.

The previous prime is 261577051. The next prime is 261577061. The reversal of 261577060 is 60775162.

It can be written as a sum of positive squares in 2 ways, for example, as 143376676 + 118200384 = 11974^2 + 10872^2 .

It is not an unprimeable number, because it can be changed into a prime (261577061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6539407 + ... + 6539446.

It is an arithmetic number, because the mean of its divisors is an integer number (45775989).

Almost surely, 2^261577060 is an apocalyptic number.

261577060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261577060 is an abundant number, since it is smaller than the sum of its proper divisors (287734808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261577060 is a wasteful number, since it uses less digits than its factorization.

261577060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13078862 (or 13078860 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 261577060 is about 16173.3441192599. The cubic root of 261577060 is about 639.5382900393.

The spelling of 261577060 in words is "two hundred sixty-one million, five hundred seventy-seven thousand, sixty".